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From The Collaborative International Dictionary of English v.0.48:
Za \Za\, n. (Min.) An old solfeggio name for B flat; the seventh harmonic, as heard in the or aeolian string; -- so called by Tartini. It was long considered a false, but is the true note of the chord of the flat seventh. --H. W. Poole. [1913 Webster] Zabaism